Hi, On Mon, Jul 25, 2011 at 3:18 PM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: > > OK, hacks below plus the following three patches make CPU hotplug work > again - with some exceptions. Here are the patches: > > 1. http://thread.gmane.org/gmane.comp.emulators.kvm.devel/76484 > 2. http://thread.gmane.org/gmane.comp.emulators.qemu/110272 > 3. http://thread.gmane.org/gmane.comp.emulators.qemu/110426 > > And here are the hacks (well, the first hunk is clearly a fix, the last > one clearly a hack, /me still undecided about the rest): thanks for these. Testing a bit late here... Applying these 3 patches + hacks/fix on master doesn't solve the initial "CPU: not responding" dmesg hotplug issue on my setup. The ACPI event is delivered correctly, but "echo 1 > /sys/devices/system/cpu/cpuX/online" still fails. e.g. tested with "-smp 1,maxcpus=2" Could you share your qemu-kvm command line? I have been trying 2.6.39 guest kernel (as opposed to 3.0.2) but I doubt that's the issue. Can someone else confirm whether this solves the issue for their setup or not? > I see two remaining problems: > - kvmclock is somehow broken, either in my guest kernel (OpenSUSE HEAD > 3.0.0-2) or the host, -cpu host,-kvmclock works around sporadic > guest lockups on echo 1 > /sys... could you explain this a bit further? specifying "-cpu host,-kvmclock" avoids the lockups? I have tried adding this to my command line but didn't help (but then again my problem is not guest lockups: the onlining fails) > - Seabios tends to lock up once every few system_reset after some > CPU has been hot-added - also in TCG mode. It seems to dislike any > setup of #CPUs > smp_cpus (whatever that implies in details). I always get a lockedup seabios when rebooting after a hotplug attempt with these patches (or with my initial vcpu_dirty workaround FWIW) thanks, - Vasilis -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
